1/2" x 3/4" Zinc Plated Steel Wavy Washers

Nominal Size: 1/2"
Inside Diameter: 1/2"
Outside Diameter: 3/4"
Thickness: 1/64"
Material: Steel
Finish: Zinc
Style: Wavy
Type: Lock Washer

Box of 10.

The purpose for a lock washer is to prevent threaded fasteners from loosening by creating friction between the fastener and the mounting surface.